I am having 11 blogs with different niches (general,health,travel,realestate,technology,finance and sports) DON.
I only have one right now, about internet stuff. But thanks a lot for reminding me, I was supposed to start a new one today.
At this time I have nine blogs but only four that are real active. I have my two favorites and that is what I put most of my energy in.
I have one blog currently, and I have one blog in development. I can't imagine updating 5 or more blogs daily. That would probably kill me.